Here is an idea for web galleries: slice up the generated JPG files into a dozen or more separate JPG images, then piece them together with HTML tables.
The resultant page would be visually indistinguishable from the current genereated HTML export pages - but it would make it a real PITA for anyone that wants to steal the images from the web gallery.
And just for fun, overlay the entire set of images on a page with a transparent gif file -- this will further confuse and confound image stealers!
Ron